Perennial stem galls of aspen caused by the popular budgall mite, Aceria parapopuli (Acariformes:Eriophyidae)
1994
Crane, P.E. (University of Alberta, Edmonton, Alberta, Canada.) | Hiratsuka, Y.
Large, black perennial trunk galls occur on trembling aspen (Populus tremuloides) in localized areas of Alberta and British Columbia. The cause of many of these galls is unknown, but some galled trees have been previously shown to be less likely to have advanced decay caused by Phellinus tremulae than are surrounding nongalled trees. In a large area of trees with multiple stem galls near Dawson Creek, British Columbia, the surface morphology of galls differed from that of galls occurring in central Alberta. The Dawson Creek galls had succulent red tissue proliferations on the surface that contained poplar budgall mites (Aceria parapopuli), which normally occur on aspen twigs, but rarely on stems. The trees in this study appear to be of one clone and, from examination of the internal gall morphology, have likely been continuously inhabited by mites for many years. The potential of these mites to induce resistance against decay needs further study
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